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How to connect a qemu / kvm mac os x guest os to internet inside WSL2

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  • How to connect a qemu / kvm mac os x guest os to internet inside WSL2

    Hello.

    I've installed ubuntu 20.04 on WSL2 and I started a VM with qemu and kvm,running mac os x as guest os. It works great,except for the configuration of the net. Infact it is not able to connect to internet. Sometime from WSL I get a 192.x.x.x ip number,like :

    192.168.69.65 ; 192.168.71.185 ; 192.168.73.223 ; 192.168.69.33 ; 192.168.100.101

    sometime I get a 172.x.x.x ip address,like : 172.22.250.54 ; 172.22.253.128 ; 172.21.138.120 ; 172.22.88.142.

    The vEthernet (WSL) adapter on Windows 10 is configued like this : 172.26.80.1 as IP address,subnet mask = 255.255.240.0

    I have created a bridge in WIndows 10,between my Intel ethernet adapter and the tap0 / Tap-windows. It's IP is 192.168.1.6 ; subnet mask = 255.255.255.0 ; gateway = 192.169.1.1 ; dns primary = 8.8.8.8

    I have configured WSL like it is explained,but it didn't work. Check below what happens :

    [email protected]:/mnt/c/Android/sdk/platform-tools# brctl addbr br0
    [email protected]:/mnt/c/Android/sdk/platform-tools# ip addr flush dev eth0
    [email protected]:/mnt/c/Android/sdk/platform-tools# brctl addif br0 eth0

    [email protected]:/mnt/c/Android/sdk/platform-tools# tunctl -t tap0 -u root
    Set 'tap0' persistent and owned by uid 0

    [email protected]:/mnt/c/Android/sdk/platform-tools# brctl addif br0 tap0
    [email protected]:/mnt/c/Android/sdk/platform-tools# ifconfig eth0 up
    [email protected]:/mnt/c/Android/sdk/platform-tools# ifconfig tap0 up
    [email protected]:/mnt/c/Android/sdk/platform-tools# ifconfig br0 up

    [email protected]:/mnt/c/Android/sdk/platform-tools# brctl show
    bridge name bridge id STP enabled interfaces
    br0 8000.00155d99cfa4 no eth0
    tap0

    [email protected]:/mnt/c/Android/sdk/platform-tools# dhclient -v br0

    Internet Systems Consortium DHCP Client 4.4.1
    Copyright 2004-2018 Internet Systems Consortium.
    All rights reserved.
    For info, please visit https://www.isc.org/software/dhcp/

    Listening on LPF/br0/00:15:5d:99:cf:a4
    Sending on LPF/br0/00:15:5d:99:cf:a4
    Sending on Socket/fallback
    DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 3 (xid=0xbbd3b615)
    DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 8 (xid=0xbbd3b615)
    DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 12 (xid=0xbbd3b615)
    DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 11 (xid=0xbbd3b615)

    [email protected]:/mnt/c/Android/sdk/platform-tools# ifconfig

    br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
    inet6 fe80::215:5dff:fe99:cfa4 prefixlen 64 scopeid 0x20
    ether 00:15:5d:99:cf:a4 txqueuelen 1000 (Ethernet)
    RX packets 172 bytes 43127 (43.1 KB)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 16 bytes 2304 (2.3 KB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
    ether 00:15:5d:99:cf:a4 txqueuelen 1000 (Ethernet)
    RX packets 543 bytes 121055 (121.0 KB)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 28 bytes 3280 (3.2 KB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
    inet 127.0.0.1 netmask 255.0.0.0
    inet6 ::1 prefixlen 128 scopeid 0x10
    loop txqueuelen 1000 (Local Loopback)
    RX packets 0 bytes 0 (0.0 B)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 0 bytes 0 (0.0 B)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    tap0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
    ether 46:88:cb:85:5f:9e txqueuelen 1000 (Ethernet)
    RX packets 0 bytes 0 (0.0 B)
    RX errors 0 dropped 0 overruns 0 frame 0
    TX packets 0 bytes 0 (0.0 B)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    [email protected]:/mnt/c/Android/sdk/platform-tools# ping www.google.it
    ping: www.google.it: Name or service not known

    I think IPv4 issue can be solved with configuring DHCP, but I don't know how to do that. I dont know why after removing address from eth0, which had an ipv4 address, and creating a bridge,it becomes no ipv4.
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